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Old 6th February 2002, 06:43 PM   #31
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Join Date: Jan 2002
Location: clinton, nj
I am in the process of building a subwoofer based on the Shiva driver. I selected the 54 liter sealed design from their website (space constraints) and added an extra baffle. I made it downfiring (to keep kids from touching) and used 1" mdf. I tested the sub with the baffle just clamped on and not stuffing, just to see that it worked. I am now in the process of stuffing and finishing the assembly of the box.

I would like to test my sub once it is finished to see if it performs as advertised. How it sounds will ultimately be the true test, but being an engineer I am almost required to quantify it.

How do I best measure F3 and frequency response? Radio shack SPL meter?

Gabe
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Old 6th February 2002, 07:04 PM   #32
ucla88 is offline ucla88  Tahiti
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gaber

are you looking for an inexpensive (read free) setup or would you actually spend money?
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Old 6th February 2002, 07:20 PM   #33
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I would prefer an inexpensive setup. I am looking to provide some sort of worthwhile info to anyone interested in building a similar sub.

Gabe
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Old 6th February 2002, 09:20 PM   #34
ucla88 is offline ucla88  Tahiti
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try browsing this thread. bunch of freeware/demoware that will work.

linky

you can use an RS meter-you can get calibration files, but you're better off buying a calibrated mike from kim girardin (see the thread above).

if you've got a decent soundcard, demo software and one of these mikes you actually could get quite good results.



Now, the actual kind of results is a separate question.

are you interested in TS parameters, an impedance curve, a freq response curve (would that be near field, ground plane, far field, anechoic, quasianechoic, in room), excess phase, group delay....etc.

again, i'm going to take this line to pimp dr d'appolito's book, Testing Loudspeakers again. well worth the money.
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